题目内容

色甘酸钠的平喘作用机制是()

A. 选择性激动β受体
B. 阻断M胆碱受体
C. 抑制PDEⅢ
D. 稳定肥大细胞膜
E. 抗炎、抗过敏

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现有: 1. interface Altitude { 2. //insert code here 3. } 和4个声明: int HIGH = 7; public int HIGH = 7; abstract int HIGH = 7; interface int HIGH = 7; 分别插入到第2行,有多少行可以编译?()

A. 0
B. 1
C. 2
D. 3
E. 4

奎尼丁对心肌细胞膜的作用主要是()

A. 抑制Na内流
B. 抑制Ca内流
C. 抑制Mg内流
D. 抑制K外流
E. 抑制K内流

public class Employee{ private String name; public Employee(String name){ this.name = name; } public String getName(){ return name; } } public class Manager extends Employee{ private String department; public Manager(String name,String department){ this.department = department; super(name); System.out.println(getName()); } } 执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()

A. smith
C. SALES
D. 编译错误

现有: 1. class Alpha { void m1() {} } 2. class Beta extends Alpha { void m2() { } } 3. class Gamma extends Beta { } 4. 5. class GreekTest { 6. public static void main(String [] args) { 7. Alpha [] a = {new Alpha(), new Beta(), new Gamma() }; 8. for(Alpha a2 : a) { 9. a2.m1(); 10. if (a2 instanceof Beta || a2 instanceof Gamma) 11. //insert code here 12. } 13. } 14. } 哪一行代码插入到第11行,将编译但是会在运行时产生异常?()

A. a2.m2();
B. ((Beta)a2).m2();
C. ((Alpha)a2).m2();
D. ((Gamma)a2).m2();

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